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Post subject: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 3:30 am
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Hey folks, not been on in a while. How's things?

My 59 Bassman LTD RI doesn't seem to be powering. The rectifier lights up, but nothing else, no other valves or the jewel light (which was never a reliable indicator anyway, but which i put down to either a loose connection or faulty bulb, as it did light upon pushing in, sometimes).

I used it only 2 days before, and everything seemed ok. Has not been moved. It has however experienced a drop from an over-exuberant and inebriated drummer in past few months, and was displaying curious drops in & out every so often. Recently replaced all the preamps with JJ's, otherwise unmodified to my knowledge. (bought second hand from an experienced gigging musician - never had any issues until recently).

Any ideas? I found this thread with the same issue, but no resolution posted. http://forums.fender.com/viewtopic.php?t=45341

Cheers for the help.

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 3:48 am
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Not much to go on. You'll have to open it up and check the insides, maybe do some voltage checks compared to the schematic. Does yours have internal fuses?

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 7:02 am
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No jewel light ? No tube glow except rectifier ?
You don't hear very light "hum" from the speaker ? Full volume ? This show if amp is alive or not.

Heater circuit do not work IMO

Look and take a voltage reading on heater circuit. From Power Transformer to pilot lamp ( jewel ) to all tubes. You must have close to 6.3 AC volts .

This amp may have a printed circuit board and plug in wires from Power Transformer , easy to have a broken printed circuit or bad connections.


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Post subject: Re: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 9:03 am
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The heater circuit is separately fused from the rest of the power supply in the LTD. It is labeled "F2, T6.3 amps". Suggest you check that before doing anything. I have a PDF schematic for the amp but don't have time to post it right now. Can do it later this afternoon. Note that the LTD schematic is different from the earlier 59 Bassman reissue schematic available on this site.

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 9:43 am
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bluesky636 wrote:
The heater circuit is separately fused from the rest of the power supply in the LTD. It is labeled "F2, T6.3 amps". Suggest you check that before doing anything.


+1

Most times when there's an issue whose symptoms include a dead pilot-lamp, the first thing that should be checked is the heater supply. Without that 6.3 VAC, the amp is sidelined and will remain so until the problem is diagnosed and repaired. The internal fuse would be a good place to start.

Arjay

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 1:14 pm
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Retroverbial wrote:
bluesky636 wrote:
The heater circuit is separately fused from the rest of the power supply in the LTD. It is labeled "F2, T6.3 amps". Suggest you check that before doing anything.


+1

Most times when there's an issue whose symptoms include a dead pilot-lamp, the first thing that should be checked is the heater supply. Without that 6.3 VAC, the amp is sidelined and will remain so until the problem is diagnosed and repaired. The internal fuse would be a good place to start.

Arjay


Then if the fuse has been determined to have failed, figure out why the fuse failed.

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 8:13 pm
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binterz wrote:
Hey folks, not been on in a while. How's things?

My 59 Bassman LTD RI doesn't seem to be powering. The rectifier lights up, but nothing else, no other valves or the jewel light (which was never a reliable indicator anyway, but which i put down to either a loose connection or faulty bulb, as it did light upon pushing in, sometimes).


Any ideas? I found this thread with the same issue, but no resolution posted. http://forums.fender.com/viewtopic.php?t=45341

Cheers for the help.


It's the 6.3VAC heater supply, for sure. The rectifier works off a separate 5VAC PT tap. Check that heater line fuse. Believe you need to pull the amp chassis from the cab to get to this fuse.


Good luck!


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Post subject: Re: Bassman 59 Reissue - no output
Posted: Sun Apr 20, 2014 9:30 pm
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59 Bassman LTD schematic:

Image

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Mon Apr 21, 2014 8:01 am
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The fuse seems fine. if the one in the attached image is the right one (red circle).

i'm a bit of a noob when it comes to amp internals and testing, and it'll end up going to a tech. i just wanna try figure how much it'll cost to do so, so a wee bit of self diagnosis would help. n.b., not a pic of my own amp, just one i google searched and put a circle on.

Image

I also put a yellow circle on the image, this wire seems to go nowhere. is this ok? it's just "hanging around" in between the core of wires. just wondered as a side, dunno if it is relevant

cheers

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Mon Apr 21, 2014 10:25 am
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The image is a bit small for me to determine the origin of the dangling wire but generally, wires are never installed merely to "hang around". Further exploration is definitely warranted.

Arjay

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Mon Apr 21, 2014 10:40 am
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maybe linking to the image will help instead... http://ghostdesigns.co.uk/wp-content/uploads/2014/04/59bassman_1-xf21.jpg

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Mon Apr 21, 2014 11:32 am
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If that is not a picture of your amp, the wire doesn't mean anything. Does your amp have the same wire that is not connected? The fuse should be checked with a meter, out of the circuit, looks can be deceiving.

But if you are going to take it to a tech, it is pointless to even discuss. :|

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Mon Apr 21, 2014 12:00 pm
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http://ghostdesigns.co.uk/wp-content/uploads/2014/04/IMG_20140421_161000.jpg

The green wire in the center is the one in question. it just goes into that core of wires, not attached at other end, but with a connector on it.

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Post subject: Re: Bassman 59 Reissue - no output
Posted: Mon Apr 21, 2014 12:11 pm
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binterz wrote:
The fuse seems fine. if the one in the attached image is the right one (red circle). How do you test it ?

i'm a bit of a noob when it comes to amp internals and testing, and it'll end up going to a tech. i just wanna try figure how much it'll cost to do so, so a wee bit of self diagnosis would help. n.b., not a pic of my own amp, just one i google searched and put a circle on.

See a qualified tech , somebody you know is qualified , not only working on music store .. this mean nothing . A qualified tech is cheaper because he know what to do and do good job and take less time .





I also put a yellow circle on the image, this wire seems to go nowhere. is this ok? it's just "hanging around" in between the core of wires. just wondered as a side, dunno if it is relevant
The other end of this wire look not connected ,the end with a "ring type terminal " at left on the picture . Sure it must be connected IMO to chassis ground . It is very unsafe to leave it loose . Is it a second hand amp ? Somebody do some work inside before ?
A close up of this left side will help


cheers


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Post subject: Re: Bassman 59 Reissue - no output
Posted: Mon Apr 21, 2014 12:14 pm
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binterz wrote:
http://ghostdesigns.co.uk/wp-content/uploads/2014/04/IMG_20140421_161000.jpg

The green wire in the center is the one in question. it just goes into that core of wires, not attached at other end, but with a connector on it.



Can't see the other end , the one with ring terminal .


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